Abstract
The population around the world indicates that lack of time is the principal barrier to practice physical activity (PA). This perception is preponderant in undergraduate students (UE). The UE is a population characterized by show high levels of psychological stress and low PA levels; these conditions increase the risk to suffer metabolic diseases. The Sprint interval training (SIT) is a training modality that show an efficient time to modify cardiovascular variables and body composition in healthy, unhealthy population and athletes. However, the impact of SIT on UE is not completely catheterized. PURPOSE: To characterize the cardiovascular and anthropometric effects of short-term running SIT in UE. METHODS: 19 physically active males UE (age:22 ±2 yrs; weight:67±6.3 kg; height: 1.7±0.07 m) participated in this study. They were randomly assigned to control (CON) (n =9) or SIT (n =10). After baseline parameters (systolic and diastolic blood pressure -SBP and DBP-, resting heart rate (HRrest), resting double product (DP)) and body composition measurements were obtained, both groups performed a graded exercise test to determine VO2max and the running speed associated with their VO2max (sVO2peak). The exercise protocol consisted of 12 sessions (For sessions 1-3, participants ran at 100% sVO2peak with recovery periods at 40% sVO2peak, with interval ratios of 2:2 min for a total of three intervals; For sessions 4-7, the interval ratio was 2:1 min with 4 intervals and finally from the 8 to 12 session, the interval ratio was 2:1 with 5 intervals). Baseline cardiovascular, and body composition were repeated within 2 days post-intervention. RESULTS: Body composition did not change significantly by group or over time. In the SIT group, HRrest was significantly lower after training (p = 0.018). Resting SBP and DP were also decreased in the SIT group compared to CON (p <0.05). CONCLUSIONS: The data presented in the current study indicate that resting hemodynamic variables are improved by short-term run SIT in active males UE. Thus, the running SIT could be an alternative model of training with lower volume of activity for the improvement of cardiovascular health in UE. Further studies are necessary to establish the impact of the gender in response to run SIT.
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